why not use sonotuube
animal
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On 1/2/2020 3:10 PM, Steven Schlegel
wrote:
I was thinking of a top about 3 in thick. It would be made with
forms made from plastic laminated mdf. Holes would be drilled
and nuts buried in place for mounting. I figure about 300 lbs of
concrete. The base could be made of angle iron. Wood would work,
too, but would need to be hefty. The forms would be removed
after the concrete set up. The concrete could be finished if
needed. Shims would be used under the lathe bed legs to remove
any bed twist. A three leg setup could be used to eliminate any
twist from an uneven floor. With a steel angle iron frame and
legs there should be lots of room for shelves and storage under
it. Moving it would be a bigger, but it is for most lathes.
I'm traveling, so please excuse any typing errors.
Steven
My 3 pennorth on lathe supports and
foundations:
What matters most are rigidity, stability of
dimensions and damping. If any of those are already inbuilt
in excess into the machine tool, then the other 2 in the
support system can be reduced. Thus, a substantial lathe
can be mounted in a ship without its mountings being
substantial.
If the lathe (etc.) has to be forced into shape
because it is a bit twisted, you need a mounting that is
TORSIONALLY stiff. A single flat plate of anything has
minimal torsional stiffness. A single large hollow section
is medium good, but would be much better with internal
diagonal braces. They don't need to be especially heavy.
You will note that the best lathes have diagonals cast into
the bed structure. Thick solid stuff (pretty well anything)
is good because it naturally includes the diagonal bracing,
and you will note that the concrete bench recenty
illustrated has great thickness. Torsional stiffness is
also good for resisting cutting forces.
Stability comes from 3 issues, namely external
inputs, temperature change and humidity change. For example
wood is very stable wrt temperature, but goes all over the
place with humidity. Different metals have different
coefficients of expansion, ferrous being lower than non-
ferrous (as a sweeping generality) and would match the lathe
metal better.
Damping is inherent in some materilas and not
others. The simple test is whether you can make a good bell
from it!
Finally, note that the stiffness of the job
itself has great influence on the tendency to vibrate.
Eddie
On Saturday, 28 December 2019, 04:35:37 GMT, Bill in
OKC too via Groups.Io
<wmrmeyers@...> wrote:
What Allan said. ;) Epoxy floor
coating would probably work fine for a sealant.
Maybe even Thompson's Water Seal. Let me know
how it works out!
Bill in OKC
William R. Meyers, MSgt,
USAF(Ret.)
A
human being should be able to change a
diaper, plan an invasion,
butcher
a hog, conn a ship, design a building,
write a sonnet, balance
accounts,
build a wall, set a bone, comfort the
dying, take orders,
give
orders, cooperate, act alone, solve
equations, analyze a new
problem,
pitch manure, program a computer, cook a
tasty meal, fight
efficiently,
die gallantly. Specialization is for
insects.
LAZARUS
LONG (Robert A. Heinlein)
Hey everyone,
New guy here, with some thoughts. I
really like this idea as I have some
experience in tying rebar together and
making forms.
If you were to put some sealer on the
top and have some channels/gutters could
you also make a coolant system built
into it? Thoughts?
Vince
On Fri, Dec 27, 2019, 9:48 PM Bill in
OKC too via Groups.Io <wmrmeyers= yahoo.com@groups.io>
wrote:
You ain't kidding!
Though you could put shelves
between the columns. I've seen a
photo of one that was cast in
one piece, similar to the one
Carla described in the PM link
someone posted earlier, and it
just had a depression for a
toe-kick, with maybe a bit of
room for knees, too. Probably at
least half again as much
concrete as the one with the
Atlas lathe on it. I'm thinking
something like that would run
close to half a ton by it's
lonesome. I though I had a photo
of that, but can't find it. If I
ever do, I'll send it to the
group. I've been looking for it
for years.
William R.
Meyers, MSgt, USAF(Ret.)
A
human being should be
able to change a diaper,
plan an invasion,
butcher
a hog, conn a ship,
design a building, write
a sonnet, balance
accounts,
build a wall, set a
bone, comfort the dying,
take orders,
give
orders, cooperate, act
alone, solve equations,
analyze a new
problem,
pitch manure, program a
computer, cook a tasty
meal, fight
efficiently,
die gallantly.
Specialization is for
insects.
LAZARUS
LONG (Robert A.
Heinlein)
On Friday, December 27, 2019,
07:46:32 PM CST, harry molwitz
< harry.molwitz@...>
wrote:
Might be tough to move
around the shop, I would
be certain of the
positioning. It also seems
to limit storage
underneath.
Harry
On Fri, Dec
27, 2019, 6:11 PM Bill
in OKC too via Groups.Io
<wmrmeyers= yahoo.com@groups.io>
wrote:
It
would be
interesting to
test and see
what difference,
if any, it made
in the accuracy
of the lathe.
Bill
in OKC
William R. Meyers, MSgt, USAF(Ret.)
A
human being
should be able
to change a
diaper, plan
an invasion,
butcher
a hog, conn a
ship, design a
building,
write a
sonnet,
balance
accounts,
build a wall,
set a bone,
comfort the
dying, take
orders,
give
orders,
cooperate, act
alone, solve
equations,
analyze a new
problem,
pitch manure,
program a
computer, cook
a tasty meal,
fight
efficiently,
die gallantly.
Specialization
is for
insects.
LAZARUS
LONG (Robert
A. Heinlein)
On Friday,
December 27,
2019, 04:17:08
PM CST, Steven H
via Groups.Io
<stevesmachining= aol.com@groups.io> wrote:
Here is a
photo of what
appears to be
a concrete
lathe bench
with an
Atlas-Craftsman
lathe on top.
Not my lathe,
just a photo I
found on-line
some time
back.
Personally I
think it's
overkill. But
concrete is
relatively
inexpensive so
knock yourself
out should you
choose to go
this route.
Good luck.
Regards,
Steven
R. Haskell
-----Original Message-----
From:
ww_big_al < arknack@...>
To:
SouthBendLathe
< SouthBendLathe@groups.io>
Sent: Fri, Dec
27, 2019 3:53
pm
Subject: Re:
[SouthBendLathe]
Southbend 9"
lathe table in
CONCRETE?
I don’t know about a lathe table, but I do fill
my grinder
pedestal
stands with
either
concrete or
sand. That
dampen
vibrations a
lot.
Al
With all of the discussions about lathe tables,
I have to
ask: What is
your opinion
about making
one out of
concrete? I
have heard
they are very
dead (no
spring) so
makes turning
a lot easier.
As I approach
putting my
1940 SB 9” A
and C lathes
into
operation, I
am planning
ahead for the
tables.
Steven
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